What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Advanced Species." This doesn't correspond to any official keyword or ability mechanic that I'm aware of in the game.
It's possible this is a made-up term, a misremembered name, or something from an unofficial or fan-created set. If you're thinking of a real mechanic, you might be looking for something like "Changeling" (a creature with all creature types), or perhaps a creature-type-matters mechanic.
If you can share where you encountered "Advanced Species"—a specific card name, set, or context—I'd be happy to help clarify what's actually going on. I'd rather give you accurate rules information than invent an explanation for a term I can't verify.
Iconic cards with Advanced Species
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